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Investments - Components of Net Realized Gains (Losses) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | $ 7 | $ 45 | $ 88 | $ 51
Gross realized gains on equity securities | 12 | 14 | 53 | 26
Subtotal gross realized gains on security sales | 19 | 59 | 141 | 77
Gross realized loss on available-for-sale securities | (4) | (8) | (97) | (388)
Gross realized loss on equity securities | (3) | (19) | (12) | (30)
Subtotal gross realized losses on security sales | (7) | (27) | (109) | (418)
Net realized gains (losses) on available-for-sale securities sales | 3 | 37 | (9) | (337)
Net realized gains (losses) on equity securities sales | 9 | (5) | 41 | (4)
Subtotal net realized gains (losses) on security sales | 12 | 32 | 32 | (341)
Gain | 0 | 36 | 0 | 36
Hybrid securities | 3 | 20 | 17 | 31
Equity securities | 280 | 200 | 421 | 591
Subtotal net holding period gains (losses) | 283 | 220 | 438 | 622
Total net realized gains (losses) on securities | 295 | 288 | 470 | 317
U.S. government obligations |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 1 | 43 | 78 | 44
Gross realized loss on available-for-sale securities | 0 | (2) | (78) | (329)
Net realized gains (losses) on available-for-sale securities sales | 1 | 41 | 0 | (285)
State and local government obligations |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | 0 | (1) | (2) | (1)
Net realized gains (losses) on available-for-sale securities sales | 0 | (1) | (2) | (1)
Corporate and other debt securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 6 | 2 | 9 | 6
Gross realized loss on available-for-sale securities | (4) | (5) | (7) | (43)
Net realized gains (losses) on available-for-sale securities sales | 2 | (3) | 2 | (37)
Commercial mortgage-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | 0 | 0 | (10) | (15)
Net realized gains (losses) on available-for-sale securities sales | 0 | 0 | (10) | (15)
Nonredeemable preferred stocks |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on equity securities | 1 | 0 | 3 | 0
Gross realized loss on equity securities | (1) | (7) | (6) | (18)
Net realized gains (losses) on equity securities sales | 0 | (7) | (3) | (18)
Common equities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on equity securities | 11 | 14 | 50 | 26
Gross realized loss on equity securities | (2) | (12) | (6) | (12)
Net realized gains (losses) on equity securities sales | 9 | 2 | 44 | 14
Residential mortgage-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0 | 0 | 1 | 1
Net realized gains (losses) on available-for-sale securities sales | $ 0 | $ 0 | $ 1 | $ 1

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